N.A.C.A, Technical Manorandain Ho.683 rigB.3,4,14 Jig,3 Picture of rotating propeller as seen "by observer looking througb the rotoscope, (The picture shows a full-size propeller. The arrangement of the mirror is somewhat different from that used in the model experiments. The plane of the mirror is… … flg.lA Part of film test: model 7 (twisted, spatially OTJXved blade) n « 196 min""^. The strikingly bright strip is a mirror edge, used as reference axis.
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